Alkane Mixtures and Related Systems

Selected Values of Properties of Chemical Compounds. Manufacturing Chemists Association Research Project, College Station, Texas, 1974. 

Dreisbach, Vapour Pressure-Temperature Data for Organic Compounds , The Dow Chemical Company, Midland, Michigan, 2nd ed., 1946. 

Pecsok and B. H. Gump, paper presented at Div. Anal. Chem., 152nd ACS Meeting, New York, Sept. 12-15, 1966. 

The pioneering work for these systems was done in 1958 by Kwantes and Rijnders who studied normal and branched chain alkanes in n-octane, n-decane, n-hexadecane, n tetracosane, and n-pentatriacontane. The results are consistent with static measurements. Measurements have also been reported by Littlewood, Martire and Pollara, and by Pearse and Thornburn, but these do not agree well with static measurements. 

The most reliable and comprehensive g.l.c. activity coefficient measurements for n-alkane systems have been done by the Bristol group using medium-high-pressure g.l.c. and taking all carrier-gas and solute imperfections into account. They have looked at the Q to Cg n-alkane solutes in Cig to Cga n-alkane solvents. Generally, the results indicate that the smaller the disparity in carbon number between solute and solvent, the closer is the activity coefficient to unity. The measured activity coefficients range from 0.930 for heptane + hexadecane at 303 K to 0.695 for heptane + dotriacontane at 348 K. Activity coefficients for many alk-l-ene + alkane systems have also been measured by this group.  

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